12202120021221 has 24 divisors (see below), whose sum is σ = 18981938135160. Its totient is φ = 7508655709056.

The previous prime is 12202120021213. The next prime is 12202120021229. The reversal of 12202120021221 is 12212002120221.

It is a happy number.

12202120021221 is a `hidden beast` number, since 1 + 220 + 2 + 1 + 200 + 21 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (12202120021213) and next prime (12202120021229).

It can be written as a sum of positive squares in 4 ways, for example, as 761929968996 + 11440190052225 = 872886^2 + 3382335^2 .

It is not a de Polignac number, because 12202120021221 - 2³ = 12202120021213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12202120021194 and 12202120021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12202120021229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 228175 + ... + 4945331.

It is an arithmetic number, because the mean of its divisors is an integer number (790914088965).

Almost surely, 2^{12202120021221} is an apocalyptic number.

It is an amenable number.

12202120021221 is a deficient number, since it is larger than the sum of its proper divisors (6779818113939).

12202120021221 is a wasteful number, since it uses less digits than its factorization.

12202120021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4739285 (or 4739282 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12202120021221 its reverse (12212002120221), we get a palindrome (24414122141442).

The spelling of 12202120021221 in words is "twelve trillion, two hundred two billion, one hundred twenty million, twenty-one thousand, two hundred twenty-one".